In programming, understanding data types is crucial.
It enables effective manipulation of variables, ensuring that operations can be performed safely and accurately.
Without data types, a computer would struggle to reliably execute tasks.
When attempting to add “Volvo” to sixteen in JavaScript, the operation will be interpreted as:
| Note: JavaScript treats the number as a string when adding a number and a string. |
Example
Example
The evaluation of expressions in JavaScript follows a left-to-right sequence, which can yield varying results depending on the order of operations.
JavaScript:
| let x = 16 + 4 + “Volvo”; |
Result:
JavaScript:
| let x = “Volvo” + 16 + 4; |
Result:
In the first example, JavaScript interprets 16 and 4 as numbers until encountering “Volvo”.
In the second example, because the first operand is a string, all subsequent operands are treated as strings as well.
JavaScript Types are Dynamic
In JavaScript, dynamic typing allows a single variable to accommodate different data types interchangeably.
Example
| let x; x = 5; x = “John”; |
